Question

Which term of an AP:2,-1,-4,.........IS -70

Answer 1

here first term (a) = 2

common difference (d) = -3

an = -70

a + (n-1)d = -70

2 + (n-1)(-3) = -70

(n-1)(-3) = -72

n-1 = 24

n = 25

Hence 25th term of this AP is -70

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Answer 2

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