Which term of AP -2,-7,-12……. Will be – 122. Find the sum of all the terms of this AP.
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Answer:
AP. -2,-7,-12 a = -2
d = t2 - a
= ( -7) - (-2)
d = 5
Sn. = n/2 ( 2a +(n- 1) d
= -122/2 (2×-2 + (-122 - 1) 5
= -61 (-4 + -123) 5
= -61( 127)5
= -61×363
= -22,143
Step-by-step explanation:
sn. = -22143
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