११+१२+१३+१४+१५+१६+१७+१८+१९+२०=? *
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please make it clear ...I'm not getting
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Answer:
11+12=23
23+13=36
36+14=50
50+15=65
65+16=81
81+17=98
98+18=116
116+19=135
135+20=155
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