self Maths Puzzle

In an A.P, the 12th term is 7 times the 2nd term and the 8th term is 3 more than 10 times the first term. What is the 5th term of the G.P whose first term is the first term of A.P and whose common ratio is equal to the common difference of the A.P.
option
A. 162
B. 144
C. 156
D. 136

Read Solution (Total 1)

let a=first term, d=c.d
a+11d=7(a+d)
a+7d=10a+3
solve
a=2,d=3
for GP, a=2,r=d=3
so T5=a*r^n-1=2*3^4=162
ans(A)
11 years agoHelpfull: Yes(3) No(0)

self Other Question

P divides his property among his four sons A, B,C and D after donating Rs 20,000 and 10% of his remaining property. The amounts received by the last three sons are in A.P and the amount received by the fourth son is equal to the total amount donated. The first son receives as his share Rs 20,000 more than the share of second son. The last son received Rs 1 lakh less than the eldest son. 2. Common Data Question 1/2. What is the total donation made by P?
option
A. Rs 55,000
B. Rs 65,000
C. Rs 75,000
D. Rs 80,000 During one grading period your test scores are 83, 79, 92, 86, 93. What is the mean, mode, and median Which measure of central tendency would give you the highest grade