Question

for what value of n are the 60,62,64,... and -10,-3,4,11... equal?

Answer 1

when n = 15
BOth is equal to 88 so n =15
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Answer 2

First a.p
60, 62, 64

a = 60. d = 2

Second a.p
-10, -3, 4, 11

a= -10. d = 7

N is equal.
Therefore
an = an

60+(n-1)2 = -10+(n-1)7
60+2n-2 = -10+7n-7
58+2n = -17+7n
58+17 = 7n -2n
75 = 5n
N = 15

Therefore the value of n to satisfy the above mentioned question is 15