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let Sm denote the sum of squares of first m natural nos for how many values of m

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TCS Other Question
B moves by taking 3 steps forward and 1 step backward (each step in one second )He walks up a stationary escalator in 118 sec. However on moving escalator he takes 40 sec to reach top .Find speed of escalator.
option
a) 1step/sec
b) 2 step/sec
c) 3step/sec
d) 4step/sec 30^72^87 divided by 11 gives remainder