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Find the sum of the first 21 terms of an arithmetic progression whose second term is 8 and fourth...
समांतर श्रेणी के n पदों का योग | samantar shreni ke n pado ka yog | formula sutra class 10 all ganit
If the ratio of the sum of n terms of two arithmetic progressions is 14-4n : 3n+5, then find the ...