For the AP: -3,-7,-11,.., can we find directly a30 - a20 without actually finding a30 and a20? Give reasons for your answer
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ya we can find this because we know that a3-a2 is equal to a1
by the same concept a30 - a20 is equal to a10
so we can directly find a10
which is equal to -39
by the same concept a30 - a20 is equal to a10
so we can directly find a10
which is equal to -39
Tamanna007:
Thanks
wlcm
hii
hey abhishek i guessur answer is wrong
a30-a20 wont be equal to a10 first of all
actually the concept would be that a30=a+29d and a20=a+19d.....................so when we subtract a20 from a30 we get ...............a+29d-a-19d....which is equal to 10 d
here d=-4..........therefore the answer would be -40 according to me
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