Miscellaneous Company Exam Company

If the sum of first n terms of an A.P is
2n2 + n then the difference of its tenth & first
term is:

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Miscellaneous Company Exam Other Question

A bag contains 5 red, 4 blue and M green
balls if the probability of getting both the balls
green, when two balls are selected at
random is 1/7, find M The error made by a clerk in calculating
simple interest for 5 months @ 6.5% and
compound interest for 6 months @ 5.5%
calculated half yearly is 25.40. Find the sum?