find the sum of first 20 multiples of 7 .
plz give me answer of above question .
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7,14,21,28,35,42,49,56,63,70,77,84,91,98,105,112,119,126,133,140
justice2:
do it using ap
okk
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the sum of first 20 multiples of 7 is 1470.
that is, 7+14+21+28+35+42+49+56+63+70+77+84+91+98+105+112+119+126+133+140=1470
that is, 7+14+21+28+35+42+49+56+63+70+77+84+91+98+105+112+119+126+133+140=1470
how can you explain
thank you so much
yeah sure
Its (7*1)+(7*2)+(7*3)+(7*4)...........(7*19)+(7*20)=1470
okay I could understand
Great!
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