find sum of first 10 terms if AP is 15 10 5
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1
Answer:
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15,10,5,...….
a=15
d=10−15=−5
S
n
=
2
n
[2a+(n−1)d]
S
10
=
2
10
[2×15+(10−1)(−5)]
=5[30−5×9]
=5[30−45]
=5(−15)=−75.
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In this AP sum of first 10 terms is.....? The answer is -75. By solving with proper steps.
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