LETS SEE WHO CAN TELL- IF THE SUM OF FIRST 28 TERMS OF AN AP IS SAME AS THE SUM OF ITS FIRST 20 TERMS THEN FIND THE SUM OF 48 TERMS OF THE SAME AP
dranupjohn:
this is only possible if a=an.therrfore the 48th term is the 20th28th term
what do u mean?? plzz clear it
this is possible if first term =last term i.e a+d=a+(n-1)d. therefore d=0. so 48 term is the 20th term which is not necessarily 0
same in case of sn
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please refer to the attachment
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hmm thats correct ✅
thanks
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