Find the sum of the following A.P : 1² - 2² + 3² - 4² +..... up to 50 terms.
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a=1^2=1
d=-2^2-1^2
=-4-1
=-5
n=50
S50=50/2{2a+(n-1)d}
=25{2+49*-5}
=25{2+-245}
=25{-243}
=-6075
santripti1234567890:
im sorry but thats not the answer. the answer is -1275. thanks for trying tho <3
How is the step for that answer
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